Merge dev (tail-toggle panel refactor) into D2 Wave 2

# Conflicts:
#	src/bank_panel.cpp

CMakeLists.txt

@@ -118,6 +118,18 @@ add_library(render_settings STATIC src/render_settings.cpp)
 target_include_directories(render_settings PUBLIC src)
 target_link_libraries(render_settings PUBLIC bank_model)
 
+# ---------------------------------------------------------------------------
+# 2f') Pure tail_control library — NO REAPER, NO SWELL. The docked bank_panel's
+#      tail-mode toggle logic (T1 exposure): TailSetting state, cycle order
+#      (None->Auto->Manual->None), the manual-length clamp to the 8 s cap, and the
+#      toggle label text. Split out so the toggle's cycle/clamp/label is unit-tested
+#      outside the DAW; the bank_panel footer that draws it + routes clicks is
+#      DAW-verified. Depends on render_settings for the pure TailMode enum + caps.
+# ---------------------------------------------------------------------------
+add_library(tail_control STATIC src/tail_control.cpp)
+target_include_directories(tail_control PUBLIC src)
+target_link_libraries(tail_control PUBLIC render_settings)
+
 # ---------------------------------------------------------------------------
 # 2g) Pure realtime_record library — NO REAPER, NO SWELL. The M8 realtime-record
 #     logic: capture scope + FX-tap point -> I_RECMODE / I_RECMODE_FLAGS values,
@@ -178,6 +190,10 @@ add_executable(render_settings_tests tests/test_render_settings.cpp)
 target_link_libraries(render_settings_tests PRIVATE render_settings)
 add_test(NAME render_settings_tests COMMAND render_settings_tests)
 
+add_executable(tail_control_tests tests/test_tail_control.cpp)
+target_link_libraries(tail_control_tests PRIVATE tail_control)
+add_test(NAME tail_control_tests COMMAND tail_control_tests)
+
 add_executable(realtime_record_tests tests/test_realtime_record.cpp)
 target_link_libraries(realtime_record_tests PRIVATE realtime_record)
 add_test(NAME realtime_record_tests COMMAND realtime_record_tests)
@@ -215,7 +231,7 @@ add_library(reaper_reasampler MODULE
     src/lane_keys.cpp
     src/actions.cpp
 )
-target_link_libraries(reaper_reasampler PRIVATE bank_model capture_paths peaks bank_grid mode_switch view_mode_model insert_plan render_settings realtime_record)
+target_link_libraries(reaper_reasampler PRIVATE bank_model capture_paths peaks bank_grid mode_switch view_mode_model insert_plan render_settings tail_control realtime_record)
 target_include_directories(reaper_reasampler PRIVATE ${SDK_INC} ${WDL_INC})
 set_target_properties(reaper_reasampler PROPERTIES PREFIX "" OUTPUT_NAME "reaper_reasampler")